Free calculators

Four quick calculators built on published research. Each one shows its formula, says who should check with a doctor first, and links every number to its source.

• Protein Calculator: How Much Protein Per Day?

  Free protein calculator: grams a day for your weight and goal, from the ISSN position stand (1.4–2.0 g/kg if you train) and a 49-study meta-analysis.

• Creatine Calculator: Your Daily Dose by Body Weight

  Free creatine calculator: your daily dose by body weight (0.1 g/kg, or 3–5 g) and an optional loading phase (0.3 g/kg a day), from two ISSN papers.

• Caffeine Cut-Off Calculator: Last Coffee Before Bed

  Free caffeine cut-off calculator: the latest time for coffee or a pre-workout before your bedtime, from a 24-study meta-analysis, within EFSA's 400 mg limit.

• Revision Timetable Maker: Free Spaced Study Plan

  Free revision timetable maker: enter your exam date and topics, and get a plan that times each review the way a spacing study of 1,350+ learners found works.